B. This goes against the theory that your horse got fat because he eats too much.
I'm not a woman, and I've never been overweight. But I see a lot of stories of women on here who are eating less all day than I eat for lunch a lot of the time, and I'm a small guy. And the more they undereat, the less they seem to burn off. It's a cycle that I don't wish on any of you, and I'm glad the OP has the courage to at least try a different approach. I applaud her.